help please

Hiya.....

I have just installed php and apache again after formatting our server running 
windowsXP
I have the latest apache and latest php....

I install them and ok, looks as if its working.... <? include '' ?> works etc...
But things like forums and pages that have: index.php?page=Links format don't 
work.... This is really confusing me, I had it working before.... Please could 
anyone help???

thanks :-)

-- Jason